đ From An Introduction To Microprocessor 8085 ⢠14. Serial Communication and Programmable Communication Interface ⢠9 questions available
Practice MCQs for Modem IC 8251 in 8085A Microprocessor. Test your knowledge with carefully crafted questions across easy, medium, and hard difficulty levels.
đ Last updated: 2026-07-30
Q1. What is the maximum number of bytes that a single DMA operation can transfer using the 8257 controller?
đĄ Difficulty: easy | â Correct: B
Q2. In a system where a peripheral asserts a DMA request, which signal tells the microprocessor that it must release the bus so the DMA controller can take control?
đĄ Difficulty: medium | â Correct: B
Q3. Two channels need to transfer 10âŻKB each, but the DMA controller can move only 16âŻKB in a single operation. Which technique allows both transfers to complete without exceeding the limit?
đĄ Difficulty: hard | â Correct: A
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